President-elect Joe Biden is moving forward with transition plans, capping a tumultuous and tension-filled campaign during a historic pandemic against President Donald Trump, who still refuses to concede the election more than one week after Biden was projected as the winner.

Trump has largely hunkered down inside the White House since the election, but Biden is pressing forward and stepping into the presidential spotlight, receiving a briefing on national security Tuesday and continuing to meet with his own transition advisers. He's also expected to name the first wave of White House senior staff as soon as this week -- despite the Trump administration refusing to grant him access to federal resources allocated for the transition of power.

A growing number of Republican senators are calling on the administration to start giving Biden classified intelligence briefings, a sign that support for Trump's refusal to concede the election may be waning among his allies on Capitol Hill.

Though Trump has alleged widespread voter fraud, he and his campaign haven't been able to provide the evidence to substantiate their claims with several of their lawsuits already being thrown out in court.